Calculator is now pinned in GNOME Continuous

[Emmanuele Bassi <ebassi gmail com>]

hi all;

I had to pin GNOME Calculator inside the Continuous manifest because
of this bug:

https://bugzilla.gnome.org/show_bug.cgi?id=741880

the newly added MPFR dependency is missing a check on its existence,
thus breaking at build-time instead of breaking at configure time.

the added bonus is that MPFR lives in Subversion, so it's going to be
extra fun to have it as a dependency.

ciao,
 Emmanuele.

-- 
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